A361640 - cp's OEIS frontend

A361640 a(0) = 0, a(1) = 1; thereafter let b be the least power of 2 that does not appear in the binary expansions of a(n-2) and a(n-1), then a(n) is the smallest multiple of b that is not yet in the sequence.

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	8
6	12
7	5
8	6
9	16
10	7
11	24
12	32
13	9
14	10
15	20
16	11
17	64
18	28
19	13
20	14
21	48
22	15
23	128
24	80
25	17
26	18
27	36
28	19
29	40
30	44
31	21
32	22
33	56
34	23
35	192
36	72
37	25
38	26
39	52
40	27
41	256
42	60
43	29
44	30
45	96
46	31
47	384
48	160
49	33
50	34
51	68
52	35
53	88
54	76
55	37
56	38
57	104
58	39
59	112
60	120
61	41
62	42
63	84
64	43

[0, 1, 2, 4, 3, 8, 12, 5, 6, 16, 7, 24, 32, 9, 10, 20, 11, 64, 28, 13, 14, 48, 15, 128, 80, 17, 18, 36, 19, 40, 44, 21, 22, 56, 23, 192, 72, 25, 26, 52, 27, 256, 60, 29, 30, 96, 31, 384, 160, 33, 34, 68, 35, 88, 76, 37, 38, 104, 39, 112, 120, 41, 42, 84, 43]

cp's OEIS Frontend

A361640 a(0) = 0, a(1) = 1; thereafter let b be the least power of 2 that does not appear in the binary expansions of a(n-2) and a(n-1), then a(n) is the smallest multiple of b that is not yet in the sequence.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	8
6	12
7	5
8	6
9	16
10	7
11	24
12	32
13	9
14	10
15	20
16	11
17	64
18	28
19	13
20	14
21	48
22	15
23	128
24	80
25	17
26	18
27	36
28	19
29	40
30	44
31	21
32	22
33	56
34	23
35	192
36	72
37	25
38	26
39	52
40	27
41	256
42	60
43	29
44	30
45	96
46	31
47	384
48	160
49	33
50	34
51	68
52	35
53	88
54	76
55	37
56	38
57	104
58	39
59	112
60	120
61	41
62	42
63	84
64	43

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	8
6	12
7	5
8	6
9	16
10	7
11	24
12	32
13	9
14	10
15	20
16	11
17	64
18	28
19	13
20	14
21	48
22	15
23	128
24	80
25	17
26	18
27	36
28	19
29	40
30	44
31	21
32	22
33	56
34	23
35	192
36	72
37	25
38	26
39	52
40	27
41	256
42	60
43	29
44	30
45	96
46	31
47	384
48	160
49	33
50	34
51	68
52	35
53	88
54	76
55	37
56	38
57	104
58	39
59	112
60	120
61	41
62	42
63	84
64	43

n	a(n)
0	0
1	1
2	2
3	4
4	3
5	8
6	12
7	5
8	6
9	16
10	7
11	24
12	32
13	9
14	10
15	20
16	11
17	64
18	28
19	13
20	14
21	48
22	15
23	128
24	80
25	17
26	18
27	36
28	19
29	40
30	44
31	21
32	22
33	56
34	23
35	192
36	72
37	25
38	26
39	52
40	27
41	256
42	60
43	29
44	30
45	96
46	31
47	384
48	160
49	33
50	34
51	68
52	35
53	88
54	76
55	37
56	38
57	104
58	39
59	112
60	120
61	41
62	42
63	84
64	43